Patent US4938532A successfully refreshed from Google Patents.
US4938532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seating apparatus
Assignee: Individual
•
Filing: 1989-01-11
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Granted: 1990-07-03
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Expires: 2009-01-11
Abstract
Abstract Seating apparatus comprising a seat support carrying a seat, a back element pivoted to said seat support which can articulate between forward and rearward positions in relation thereto, and torsion bar means extending between the back element and the seat support which resiliently bias said back element towards the forward position.
Inventors
- 👤 Gerald N. Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:25
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/445; A47C7/4454
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
Seating apparatus comprising a seat support, back element pivotally connected to said seat support for pivoting movement between spaced apart forward and rearward positions, stop means mounted to and interacting between said seat support and said back element for limiting said pivoting at said forward and rearward positions, torsion bar means having axially spaced apart ends, said seat support being rigidly connected to said torsion bar means between said ends, said back element being rigidly connected to said torsion bar means at points spaced away from and on each side or said rigid connection to said seat support, said spaced apart and, of said torsion bar means pivotally connected to said seat support for effecting said pivoting movement between said back element and said support, and said torsion bar means being constructed and arranged for effecting resilient pivoting of said back element towards the rearward position when loaded and returning said back element to the forward position when unloaded.
Claim 2
Dependent Claim
159 words
Seating apparatus comprising a seat support, back element pivotally connected to said seat support for pivoting movement between spaced apart forward and rearward positions, stop means mounted to and interacting between said seat support and said back element for limiting said pivoting at said forward and rearward positions, torsion bar means having axially spaced apart ends, said seat support being rigidly connected to said torsion bar means between said ends, said back element being rigidly connected to said torsion bar means at points spaced away from and on each side or said rigid connection to said seat support, said spaced apart and, of said torsion bar means pivotally connected to said seat support for effecting said pivoting movement between said back element and said support, and said torsion bar means being constructed and arranged for effecting resilient pivoting of said back element towards the rearward position when loaded and returning said back element to the forward position when unloaded.
Claim 3
Dependent Claim
18 words
Seating apparatus as claimed in claim 1 in which the torsion means are made from an aluminium alloy.
Claim 4
Dependent Claim
23 words
Seating apparatus as claimed in claim 1 in which the seat element and the back support are made from a light weight material.
Claim 5
Dependent Claim
21 words
Seating apparatus as claimed in claim 3 in which the seat support and the back support are made from tube material.
Claim 6
Dependent Claim
13 words
Seating apparatus as claimed in claim 4 in which the tube is square.
Claim 7
Dependent Claim
25 words
Seating apparatus as claimed in claim 1 in which the seat support is shaped to allow the seating apparatus to nest one above the other.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |